Question

tìm x biết  -15-(x+25)+(18-x)=17-(x+7)

Answer 1

<=> -15 - x - 25 + 18 - x = 17 - x - 7

<=> -8 - 2x = 10 - x

<=> -2x - x = 10 - (-8)

<=> -x = 18

<=> x = -18